A Perovskite Electrocatalyst for Efficient Hydrogen Evolution Reaction

Abstract

Perovskite oxides are demonstrated for the first time as efficient electrocatalysts for the hydrogen evolution reaction (HER) in alkaline solutions. A-site praseodymium-doped Pr0.5 (Ba0.5 Sr0.5 )0.5 Co0.8 Fe0.2 O3- δ (Pr0.5BSCF) exhibits dramatically enhanced HER activity and stability compared to Ba0.5 Sr0.5 Co0.8 Fe0.2 O3- δ (BSCF), superior to many well-developed bulk/nanosized nonprecious electrocatalysts. The improved HER performance originates from the modified surface electronic structures and properties of Pr0.5BSCF induced by the Pr-doping.

Evaluation of A-Site Ba2+-Deficient Ba1−xCo0.4Fe0.4Zr0.1Y0.1O3−δ Oxides as Electrocatalysts fo

“…In a perovskite structure, the octahedral building containing a transition-metal cation and contiguous 6-fold coordinated oxygen anions could play the role of heterojunctions and possibly be reactive sites for HER. Very recently, the perovskite oxides Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ , Pr 0.5 (Ba 0.5 Sr 0.5 ) 0.5 Co 0.8 Fe 0.2 O 3− δ , and SrNb 0.1 Co 0.7 Fe 0.2 O 3− δ were found to be highly active and stable for HER [13, 14], which demonstrate the remarkable effectiveness of perovskite oxides as candidates for the HER catalyst. However, up to now, studies on the activity of perovskite oxide for HER are scanty, due to the unclear HER mechanism on these materials.…”

“…In this study, the composition of BaCo 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3− δ (BaCFZY) was chosen as the parent perovskite oxide for A-site Ba 2+ -deficiency doping because BaCFZY was found to have a high ability for proton uptake by the incorporation of H 2 O (H 2 O + V O ∙∙ + O O x ↔2OH ∙ ) and high structural stability in alkaline media, which would be favorable to HER [17]. Meanwhile, as a case study, we evaluated the HER activity of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ (BSCF), one of the most spotlighted perovskite oxides that is assumed to be a strong catalyst candidate for ORR/OER/HER given it is with high catalytic activity [10, 13, 18]. The effects of Ba 2+ deficiency on the crystal structure, surface chemical properties, microstructure, electrochemical activity, and stability of BaCFZY for HER were carefully investigated.…”

Defective MoS2 electrocatalyst for highly efficient hydrogen evolution through a simple ball-milling method

“…However, the high price and scarcity of the noble metal have critically impeded the large-scale application for hydrogen energy [7]. Thus it still remains a challenge to develop highly active HER catalysts based on materials that are more abundant at lower cost [8][9][10][11][12][13][14].…”

Enhanced Electrocatalytic Activity of Dual Template Based Pt/Cu‐zeolite A/Graphene for Methanol Electrooxidation

“…It is very meaningful to develop efficient and eco-friendly energy resources. [1] As one kind of clean energy conversion devices with environmentally green operations, fuel cells are regarded as promising "power plant" for portable and mobile applications. [2,3] Among the different types of fuel cells, direct methanol fuel cells (DMFCs) have attracted much attention due to their merits, such as low operation temperature, high energy conversion efficiency, low pollutant emission, etc.…”